In invertebrates with open circulatory systems, hemolymph is composed of:
A. plasma.
B. interstitial fluid.
C. plasma plus intracellular fluid.
D. plasma plus interstitial fluid.
D. plasma plus interstitial fluid.
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Which scenario is not an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil. b. A peacock puts on a different mating display than a sparrow. c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls in the other direction. d. A zebroid, a cross between a horse and zebra, is sterile. e. One type of roundworm would reject the sperm from another species of roundworm.
If you see a red flower with very little odor, it is likely pollinated by ____
a. flies b. birds c. bats or moths d. butterflies e. bees
61. Tiktaalik either crawled or paddled in shallow tropical streams about 380 MYA, during the late Devonian period. These shallow waters often became anaerobic. What selective advantage would Tiktaalik have under these conditions?
A. It could crawl on shore and feed on birds and reptiles that were on land. B. It could lift its head out of the water and breathe air through its gills. C. It could crawl out of the water and walk over to new shallow streams. D. It could lift its head out of the water and breathe air through its lungs. E. It could swim better than fish.
Ecologists use a variety of useful sampling and statistical techniques for delineating and classifying communities
Indicate whether the statement is true or false